package practice;

/**
 * Description:
 *
 * @Author cowen
 * @Create 2023/10/18 11:24
 * @Version 1.0
 */
public class FloatDouble {
    public static void main(String[] args) {
        double PI =3.1415926;
        double r1 =1.2;
        System.out.println("圆的面积为："+PI*r1*r1);
    }
}
